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Roger Federer insists his dominant record against US Open semi-final opponent Nikolay Davydenko means nothing when he comes up against the Russian at Flushing Meadows on Saturday.

Top-seeded Federer meets his fourth-seeded opponent in the last four for the third time in the last five majors. The Swiss star has won all of those matches and has beaten Davydenko nine times in a row in total – including seven times in straight sets.

“I think he’s a fantastic player,” Federer said. “(He’s) totally underrated – still sometimes in the media. Even though I have a great record against him, I’m aware of his ability.”

He added: “It was a very close match we did at the French Open this year in the semis. Last year I played out of my head in the semis, I remember.”

The three-time champion has only lost two sets here – the first one in the third and fourth round to John Isner and Feliciano Lopez respectively.

He won the first two sets against Roddick, this year a quarter-final opponent, in tiebreakers and then finished the two-hour clash with a relatively easy third set.

That extended his winning streak in the US Open to 25, a run that dates to a fourth-round loss to David Nalbandian in 2003.